Electric lock.



l ELEcTmc Loox (Ilo Model.)

. T. P. PRATT.

Patented July 3|, |900.

(Applicatiqn med Apr. 21, 1909.)

NVEN'T'UR: 7 Uf @nab-C,

. mi f5 www Nirnn STATES ATENT @Briest fri-inononn r. PRATT, Qrrosron, MAssAoHusE'rTs, Assiettes 'ro FRED WARREN CLARK, or SAME PLACE;

'LECTR'IC Look.

srncrricnron rmingpst Lettesfrtet No. 655,066, dated .Tiny 31',V 1906."

' Application ma April ziiiso. A srni N. 13,737. (no man.)

To aZZn/wm it mag/concern,.- v

Beit known that lLTHEoDoRE P. PRATT, of Boston, in the county of Suffolk and State of Massachusetts; have invented certain new and useful Improvements in'Flectric Locks, of which the following is a specification. i

This invention'relates to an electric lock or latch the bolt of which is adapted to be( op- Whichvthe operation ofthe bolt by the knob- 4 representsa section on the line Li 4 of Fig.

A and claim.

spindles is controlled by: an electromagnet within thecasing, said magnet being included in an electric circuit adapted to be closed and iorollren at one or more points remote from the l One of the Objects of my inventionis to provide a lock of this class having independently-operating outside and inside knobs and electrically-controlled devices whereby either knob can be controlledand made operative or inoperativebythe act of aperson at a distant point in changing the conditions of the electric circuit;

Other objects ofthe invention are to provide a compact arrangement of the various parts of the lock and to minimize the work j of the latch-bar d and provided on its under which the electromagnet has toperform.

The invention consists inthenovel features of construction and relative arrangement of parts which I shall now proceed to describe Of nthe'accompanying drawings, forming a a door provided with my innproved lock.,` Fig. 2 represents a lock in side elevation with one of the side plates of the casing removed,

showingtheloek in its normal condition and adapted to 'be operated bythe'insideknob. Fig. 3 is a similar view showing the position of the knob-operaied'parts when the outer knob has been rotated to draw the bolt. Fig.

2. Fig. 5 isa similar view to Fig. 4, showing the lock in a condition to be operatedbythe outside knob. Fig. 6 is a view similar to Fig. 2, showing the position of the key-operated parts when the key has been inserted and turned to draw the bolt. Fig. v7 represents a Section on line 7 7 of Fig. 2. Figs. 8 and 9 are detail perspective views showing certain of the key-operated parts.

, i The same letters of reference indicate the same parts in all the iigures.

Referring to the drawings, a designates the casirigof the lock, ct the face-plate, and b a bolt-head or latch which occupies an opening in the face-plate, being pivoted at ZJ at one side of said opening. A link c connects the bolt-head with one end of a sliding latch-bar d, in which is a slot d', which allows the bolthead to yield when the door is closed.V Lugs a2 as, formed on the casing a, act as guides to the latchfbar, and a spring-pressed plunger cl2, which occupies a socket in the rear end of said latch-bar, abuts against the casing and tends to project the latch-bar-in the direction of the bolt-head or latch, its forward motion `being limited by means of a stop dabutting against one of the lugsaz. The bolt-head is normally projected by a spring e, and its forward motion is limited by the'engagement of the link c withthe endof the slot d'. Thus it will be seen that by slidingthe latch-bar d ltoward the rear wall of the casing'a the bolthead or latch will be retracted.'

f designates a dog pivoted at f to one side side beneath said pivot with a projection or lug f2. Between an abutment on the latchbar and the rear side of said projection is located a spring f3, which normally keeps the dog in the position shown in Fig'. 4. The front side of said projection is adapted to be engaged bythe armature g'of an electromagnet whose coils h h form 'part of an electric circuit, which enters and leaves the door by way of the yielding contact-plungersi c', 4connected to 'suitable conducting-wires. `W'hen said lmagnet is energized,the armature is attracted andthe dog fdepressed to the positionshown inFig'i 5, the*V two returning to their `normal positions 'when' the electric circuit is open.

. fijfj designate Ytwo bell-crank tumbler-dogs mountedtooscillate independently'on a xed stud i2 andA provided with springs j3,' which @keep them in yielding contact with the'knoboperated tumblers 7c k'. The said tumblers are of the usual construction and operate by ithe turning of their respective knob-handles ineither direction to oscillate the tumbler- IOO dogs jj', the tumbler Za correspondingr to the inner knob-handle and the tumbler lo to the outer one. The upper or operating ends of thetwo tumbler-dogs jj' are located side by side in juxtaposition to the pivoted dog f, upon which either may operate to retract the b`olt,raccording to the position .of said dog f. When in the normal position, (shown injFig 4,) the rotation of the inner knob causes the -tumbler-dogj to engage a head f4 Qn t-he dog j', and therebyV slide the latch-bar d rearwardly and retract the bolt-head b. When the pivoted dog is in its normal position, the

turningof the outer knob'will'oscillate the tumblerdogj', but will net retract thejbolt; as may-be plainly seen in Fig. 4:. When it is desired to make the outer knob operative, the Velectric circuitis completed at somejpoint i yand-.theattra-cti'on of the armature g by the ,zo

el'ectromagnet hh brings the head f4 of the pivoted dog into the path of the tumblerfdog j', as. shown in Fig. 5, in which position fthe rotation `of the outer knob will cause said tumbler-dog to engage the pivoted dog fand retract the bolt-head b. tion of the parts the inner knob will beinoperative, and aperson maythereby be prevented from departing from the vhouse or apartment by any one in control of the electric circuit. y y Y v,

AThe means for operating the bolt-head h by a key comprise, as here shown, a `dog Z029,

pivotedto affixed stud kil and engaging a stud d4. on the latch-barv d, a T-shaped lever m, pivoted underneath the dog lo to a fixed stud m and adapted to engage either one of 'two ears R22 7625, formed on said dog, and

a pivoted arm fn', adapted to be turned by a` key and to engage the stem m2 ofthe T- shapedA lever m. ,The pivoted 'arm nl forms part of a cylinder-lockW/n .of approved pattern,'which screws into a threaded vsocket in' the casing a and is reversibly held therein by means of an elongated pin n2, which may be adjusted from theoutside of the 'faceplate dand which engages either of two oppositelylocated grooves 'in said lock. The arm n is adapted by the reversibility of fits-casing to engage either side of the stem m2, and it will be observed .thatthe dog 7a2@ operates to retract the latch-.bar clby the turning of the lever fm in either direction on its pivot.

It will now be seen thatI have provided a very advantageous construction andarrangementof parts in myimproved lock. The 1ov` cation of the magnet-coils on the rear wall of the .casing instead of on the top orbottom` wall, as is usually thecase, avoids the neces sityfor carrying the terminal Wires from said coils across the casing to the binding-posts orstuds on the rear wall thereof. The coils are-'instead situated in immediate proximity to said binding-studs h', and the -wires leading thereto are very short and free from all liability to short-circiliting by .contact withl any-vof .the movable parts of the lock. s The magnet-coils hfh are separatedsuflciently,

In this latter posi-` -as will be seen, to admit the latch-bar d between them, and the armature for a like purpose.- Y

Itis obviously of vital importance in locks g is recessed of this character that the electromagnet may always be depended upon to perform its func4 tion. If for any reason the electric lcurrent whichis used to-energize the magnet becomes weakened, the power ofsaid magnet is de-- creased as a consequence, and it is from this dog and minimizing the force necessaryto tilt the same. l ,i d

-I donot confine myself.. 'to theexact .con-

struction of any of the above-described .parts or features, but `reserve the right to a proper amount of variation consistent withthe .scope ofjmy invention. d Y Y L Iclaima Y. 1. In an electric lock, the combination of a pivoted bolt-head or latch, alatchfbar con-V nected -with said latch. and adapted tofbe moved to Aretract the.same,.tw,o independent knob e operated tumbler dogs arranged in 4proximity to said la`tch4bar,-a dog pivoted to the latch-barand adapted tube moved sim-ul-` taneously into engagement with one tumblerdog and out of engagement withtheether, said bolt having a spring whereby it..is normally engaged with one of vthe tumblerfdogs and normally separated from the 0ther,andA I electrically-controlled .means .for 4-displacing the latch-bar dog from its..normal. position and moving it into engagement withthe tuin--- bler-dogffromwhich it is normallyseparated. 2. In an electric lock, the combination of .a

Iro`

pivotedl bolt-head o-r latch, a latch-bar con- -nected with said latch and adapted to retract the same, two independently-operated tumbler-dogs arranged in proximityv to said1atehbar, a dog `pivoted tothe latch-bar and'adapted to -be moved simultaneouslyinto engagement with one tumbler-dog :and out ofV engagementwith the other, saiddog being normally Vengaged with one tumbler-dogV and separated from the other, an electromagnet,

land an armature for said magnet'gadapted to move the latch-bardog out of engagement with one tumbler-dog and into Aengagement with the other when theposition ofthe arma tureis shifted; Y

3. In an electric lock, the combination of a latch, -a latch-bar .connected therewith and adapted to be moved to retract the same, two independentlknob-operatedtumbler-dogs ari 655,066 l if ranged in proximity to said lat-cabal', a dog pivoted to the latch-bar and adapted to engage either of said tumbler-dogs, an electromagnet having two coils situated on either side of the latchbar, and an armature pivoted at one side of said latch-bar and adapted to engage the pivoted dog intermediate of the j ends of said armature, for the purposes speciied.

4. In an electric lock, the combination of a casing, a pivoted latch, a latch-bar connected therewith and adapted to belmoved to retract the same, two independent knobf operated tumblers arranged on one side of said latchn bar and with their ends in proximity thereto, a dog pivoted to said latch-bar and adapted to engage either of said tumbler-dogs, an electromagnet attached to the rear wall of the easing for the purpose specified and having two coils arranged on either side of the latch-bar, a pivoted armature adapted to en gage the latch-dog intermediate of the ends vof said armature for the purposes specied,

a dog pivoted to the casing at the opposite side of the latch-bar from the knob-operated tumbler-dogs and engaged withY said latchbar, and a T-shaped key-operated lever pivoted underneath said dog and engaged there with, the said lever being adapted to be turned in either direction to cause the said dog to retract the latch.

In testimony whereof I have affixed my sig nature in presence of two witnesses.

THEODORE P. PRATT.

Witnesses:

C. F. BROWN, J. R. TUFrs, Jr. 

